Improvement in slate-frame attachments



0. GOLDTHWAIT. Slate-Frame Attachment.

No. 200,137. "Patented Feb. 12, 181-8.

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UNITED STATES PATENT OFFICE.

CHARLES GOLDTHWAIT, OF SOUTH WEYMOUTH, MASSACHUSETTS.

IMPROVEMENT IN SLATE-FRAME ATTACHMENTS.

Specification forming part of Letters Patent No. 200,137, dated February12, 1878; application filed January 2, 1878.

To all whom it may concern:

Be it known that I, GHARLEs GOLDTHWAIT, of South Weymouth, of the countyof Norfolk and State of Massachusetts, have invented a new and usefulImprovement in School- Slates and Pencil- Sharpeners therefor; and dohereby declare the same to be described in the following specification,and represented in the accompanying drawings, of which-- Figure 1denotes a'top view of a school or writin g slate provided with apencil-sharpener in accordance with my invention. Fig. 2 is-atop view,and Figs. 3 and 4 transverse sections of the pencil sharpener, itsdiametric holding-bar, and dust-receiver.

The object of my invention is to enable a scholar to readily sharpen hisslate-pencil without the necessity of using a knife therefor, and tohave attached to the slate a convenient means for such purpose; also tohave, in conjunction therewith, a receiver or pan to catch or interceptthe dust or filings removed from the pencil.

In the drawings, A denotes a common writing-slate; and B, a circularpan, fixed or applied to it at or near one corner of its frame a.Extending diametrically across the pan is a flat wooden bar, 0, groovedtransversely at its middle to receive and hold a metallic plate, D,which is grooved transversely or formed with file-teeth on its uppersurface. Extending through the bar 0, at its center, is a headed pin orstud, b, which goes through the bottom of the pan, and extends below ita short distance, and enters a corresponding hole in the slate-frame. Ascrew-thread may be formed on this stud, if desirable. The stud may befastened at its upper end to the file or plate D; or instead thereof itmay be secured directly to the bottom of the pan and extend downtherefrom.

The bar may be fitted tightly in the pan, or may be fastened therein inany proper manner. It not only serves to support the toothed plate andto keep it above the bottom of the pan, but, being of wood, it answersto muffle the noise created during and by the process of sharpening thepencil on the toothed plate or file D.

To effect such sharpening, the pencil, held in the hand, is to be movedto and fro on the teeth of the file, the dust or filings dropping intoand being caught by the pan. By thus intercepting the dust it will beprevented from getting on the slate or the desk or surrounding objects.Subsequently it may be discharged from the receiver.

I claim as my invention- 1. The combination of the stud b with thepencil-sharpener D and the dust-receiver B, as specified.

2. The combination of the slate-frame, the pencil-sharpener D, the studI) attached thereto, the diametric bar 0, and the dust-receiver B, allbeing arranged and applied substan; tially as set forth.

CHARLES GOLDTHWAIT.

Witnesses:

R. H. EDDY, JOHN R. Snow.

